Muniz, Luciano Cavalcante, et al. “Soil Biological Attributes in Pastures of Different Ages in a crop‑livestock Integrated System”. Pesquisa Agropecuaria Brasileira, vol. 46, no. 10, Jan. 2012, pp. 1262-8, doi:10.1590/S1678-3921.pab2011.v46.8533.